Each sale contributes (price − variable cost) towards your fixed costs. Break-even is where those contributions have covered them all — before it, every month loses money; after it, every sale is profit.
Break-even units = fixed costs ÷ (price per unit − variable cost per unit). The bracket is the contribution margin: what each sale actually contributes after its own direct costs.
Costs that arrive whether or not you sell: rent, salaries, software subscriptions, insurance, loan EMIs. Variable costs scale with each unit — materials, packaging, payment-gateway fees, per-order shipping.
Then every sale loses money and no volume can break even — the calculator says so rather than showing a meaningless number. The fix is pricing or cost structure, not volume.
You cannot sell a third of a unit. 333.3 computed units means the 334th sale is the first profitable one, so the tool always rounds up.
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